合金钢连杆在不同冷却介质中淬火后的组织与性能

doi:10.13251/j.issn.0254-6051.2023.08.011

金属热处理 ›› 2023, Vol. 48 ›› Issue (8): 64-71.DOI: 10.13251/j.issn.0254-6051.2023.08.011

合金钢连杆在不同冷却介质中淬火后的组织与性能

齐羿^1,2, 杨建全², 焦斐²

1.山东大学机械工程学院, 山东济南 250061;
2.中国重型汽车集团有限公司, 山东济南 250100

收稿日期:2023-03-10 修回日期:2023-06-12 出版日期:2023-08-25 发布日期:2023-10-10
作者简介:齐羿(1987—),男,工程师,硕士,主要研究方向为汽车零部件的锻造及热处理工艺,E-mail: 114261053@qq.com

Microstructure and properties of alloy steel connecting rod quenched in different quenching media

Qi Yi^1,2, Yang Jianquan², Jiao Fei²

1. School of Materials Science and Engineering, Shandong University, Jinan Shandong 250061, China;
2. China National Heavy Duty Truck Group Co., Ltd., Jinan Shandong 250100, China

Received:2023-03-10 Revised:2023-06-12 Online:2023-08-25 Published:2023-10-10

摘要/Abstract

摘要： 选择不同淬火介质包括水、淬火油、AQ251淬火液(浓度分别4%、8%、12%)作为研究对象,通过冷却特性、显微组织、硬度、拉伸性能、冲击性能等试验,结合冲击断口形貌分析以及小批量试制探伤和质量检验,分析淬火冷却介质对合金钢连杆组织与性能的影响。调质后5组试验连杆均得到回火索氏体,冷却能力越强的淬火介质得到的显微组织等级越高、硬度越高、抗拉强度越高,而冲击吸收能量相对降低;通过5组冲击试样断口微观形貌分析,均属韧性断裂;结合小批量试制探伤和质量检验,冷却能力越强的淬火介质得到试验连杆裂纹和畸变越大,产品合格率越低。因此,综合考虑各方面数据结果,可知淬火油是最佳淬火介质,具有良好的内在组织和综合力学性能,包括显微组织3级、淬火布氏硬度压痕直径平均值ø2.82 mm、回火布氏硬度压痕直径平均值ø3.83 mm、抗拉强度836.87 MPa、屈服强度705.23 MPa、断后伸长率19.13%、断面收缩率62.44%、冲击吸收能量86 J,经生产实践证明废品率2.0%,相比其他4组,淬火油综合优势更明显,实际应用中可优先考虑。

关键词: 淬火介质, 连杆, 组织与性能, 探伤和质量检验

Abstract: Different quenching media including water, quenching oil and AQ251 quenching liquid (concentration 4%, 8%, 12%, respectively) were selected as the research objects. Through the cooling characteristics, microstructure, hardness, tensile properties, impact properties and other tests, combined with the impact fracture morphology analysis, small batch trial testing and quality inspection, the influence of quenching medium on microstructure and properties of the alloy steel connecting rod was analyzed. The results show that after quenching and tempering, tempered sorbite can all be obtained for the five groups of the connecting rods. The quenching medium with stronger cooling capacity has higher microstructure grade, higher hardness and higher tensile strength, while the impact absorbed energy is decreased. Through the analysis of the impact fracture morphology of five groups, all of them belong to ductile fracture. Combined with the small batch testing and quality inspection, the stronger the cooling capacity of the quenching medium, the larger the crack and distortion of the tested connecting rod, the lower the qualified rate of the product. Therefore, after comprehensive consideration of the results of all aspects of data, the quenching oil is the best quenching medium with good internal structure and comprehensive mechanical properties, which includes three levels of microstructure, average diameter of the quenched Brinell hardness indentation of ø2.82 mm, average diameter of the tempered Brinell hardness indentation of ø3.83 mm, tensile strength of 836.87 MPa, yield strength of 705.23 MPa, elongation after fracture of 19.13%, the percentage reduction of area of 62.44% and impact absorbed energy of 86 J. The production practice has proved that the rejection rate is 2.0%. Compared with the other four groups, the quenching oil has more obvious comprehensive advantages and can be given priority in practical application.

Key words: quenching medium, connecting rod, microstructure and properties, flaw detection and quality inspection

中图分类号:

TG162

齐羿, 杨建全, 焦斐. 合金钢连杆在不同冷却介质中淬火后的组织与性能[J]. 金属热处理, 2023, 48(8): 64-71.

Qi Yi, Yang Jianquan, Jiao Fei. Microstructure and properties of alloy steel connecting rod quenched in different quenching media[J]. Heat Treatment of Metals, 2023, 48(8): 64-71.

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合金钢连杆在不同冷却介质中淬火后的组织与性能

Microstructure and properties of alloy steel connecting rod quenched in different quenching media

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